Awhile back, there was someone else (SpincruS) who wanted to do a Peleponesian War Scenario. I said that the map must extend into Asia Minor (The Athenian's ionian allies, plus the ever dangerous Persians) and all the way to Sicily. East Sicily would be the minimum, but giving Carthage control of the west would be interesting (the greatest portion of Carthage's histroy involved wars over the control of Sicily. They even allied with the Etruscans against the Greeks in Sicily and Italy). I said I wasn't sure if Rome should be in (you could use the Greek cities in Italy instead, such as Terentum and Cumae).
He felt that the main thing in the map would be the Aegean Islands. "(I'm not talking about the major islands only, but also the smaller ones). Melos, a small island (colony of Corinth) that didn't accept to join the Athenian alliance, for example, was destroyed by the Athenians and re-colonized by them. Potidea, although not an island, was important.
Furthermore, Cosira, the second strongest naval power in the peninsula after Athens, was somewhat more to the north of the Ionian sea."
Anyway, I thought I'd bring up those points that I had already discussed on a previous project (I don't know if SpincruS will ever finish his project, I guess I could ask him to help with this one). I'd like to help with this one as well.
I would have the Delian League as a definate under Athenian Control (at this point, the tresury had been moved into Athens and its league members were forced to stay in this Athenian Empire). Sparta was a little different. They basically have the southern Peleponese under their direct control, but they had other states who agreed to give support if they go to war with Atehn (The Peleponesian League). I think they should be several civs (I'm not sure the exact many, though, but Thebes and Syracuse would probably be allied civs).
I think a lot of units should have amphibious ability since most of the fighting was raids and counter raids of the opponent's allied islands. Sparta had no seige equiptment to break the Longwalls, Athens didn't have a strong enough army to break the Spartan stronghold on the continent (although they did manage at one point to break the myth of Spartan superiority and get some Spartans to surrender). Plague affected Athens a lot (either you can represent this with jungle or Flood plain, or just wait and see what Conquests can do).
I did some thinking about units. After the war, when Thebes fought Sparta, Sparta's greatest weaknesses were discovered. The age of the old Hoplite battle systems (Hoplites would meet head on and would win in basically a battle of wills, which Sparta had the advantage) was over. New infantry formations (such as stacking hoplites twice as deep on one side, as oppoesed to 3 even sides), Missile Tactics, and seige equiptment (seige Towers, Battering Rams) were becoming more important. If your game goes past the end of the war, this would be an important factor.
But if it ends eariler than that point (and the rise of Macedonia as well), I'll see if I can think of anything to add.
What about Persian Immortals (Don't use them like they are represented in the game, give them Spears, and don't make them able to be built. They were Royal body guards, not military units). In addition, you should give the Persians some kind of Persian looking Archer (I don't know if anyone made it, though), Persian looking Horse Archer, some Greek Mercenaries (probably from Ionia, but it doesn't really matter), and Spearmen (not sure if its possible to get a Persian looking Spearmen that doesn't look like an Immortal).
That's Persia, I can't think of many unique Greek units, and all that's left is possible civs in the west (Carthage, Rome, the Etruscans are ideas, no matter how poor).